Heating a mixture of water sample, potassium dichromate digestion solution, silver sulfate solution (silver sulfate as a catalyst can more effectively oxidize linear fatty compounds), and concentrated sulfuric acid to 170 ℃, the color of the organic matter in the dichromate ion oxidation solution will change. The analyzer detects this color change and converts it into COD value output. The amount of dichromate ions consumed is equivalent to the amount of oxidizable organic matter.
1. The digestion colorimetric process of the instrument is completed in one, with a simple and reliable structure, reducing the possibility of errors.
2. Adopting imported modified polytetrafluoroethylene transparent hose with a diameter greater than 1.5mm, reducing the probability of particle blockage in water samples.
3. It can automatically clean the sampling pipeline to prevent the formation of algae or biofilm.
4. After abnormal reset and power failure, the instrument will automatically discharge residual reactants and restore working status.
5. Low failure rate, minimal maintenance, and low reagent consumption.
6. The intelligent fault self diagnosis function, alarm prompt, instrument management and maintenance are very convenient.
7. Adopting multi-channel valves, it has strong anti-corrosion performance, long service life, and is safe and reliable.
| Model No. | YK-DH310C1 |
| Methodological basis | National Standard GB11914-89 Water Quality - Determination of Chemical Oxygen Consumption - Dichromate Method |
| Measurement range | 10~2000mg/L COD |
| Accuracy | Display value error ≤ ±10% |
| repeatability error | ≤±10% |
| measuring cycle | Minimum measurement period is 40min, according to the actual water samples can be modified at any time from 5~120min. |
| sampling period | Time interval (20~9999min arbitrary adjustable) and whole point measurement mode |
| correction | Sensitivity and zero calibration can be performed at regular intervals. |
| calibration period | 1~99 days any interval any time adjustable |
| Maintenance Cycle | Usually once a month for about 30 minutes |
| analog output | 1 channel 4~20mA output (optional 2 channels 4~20mA output) |
| signal interface | RS232 or RS485 |
| Switching volume | Optional 1-6 relay outputs, 220VAC/2A capacity |
| Comparison of actual water samples | Tolerance ≤±10% |
| MTBF | ≥720h/session |
| Environmental requirements | Recommended temperature +5~28℃; humidity ≤90% (no condensation) |
| Size | H 1430 x W 500 x D 403 (mm) . |
| Power source | AC220±10%V, 50±10%Hz, 5A |
| Others | Abnormal alarms and power failures do not result in data loss. Touch screen display and command input; |
| Abnormal reset and power failure, the instrument automatically discharges the residual reactants in the apparatus and automatically restores the working state | |
| typical application | Municipal sewage treatment plant import and export water quality online monitoring, industrial pollution source wastewater online monitoring, industrial process |
| Online monitoring of water use, etc. |
